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Metrological support of phase-chronometric systems (part 1)
Engineering Education # 12, December 2012
DOI: 10.7463/1212.0514343
This article presents an approach to metrological support of data measuring systems operating under field conditions of technical objects where there is a restriction on the access to their primary transducers due to repair intervals. Calibration intervals of measuring devices often don’t correspond to repair intervals. Under the circumstances, it is necessary to evaluate metrological characteristics of measuring channels while machines and mechanisms operate. In this case controlled parameters of the measuring channel must be independent of the features of the device operation and external actions. The proposed method is implemented with the use of multi measurement and measurement planning processes. The quality of the measuring process relative to the systematic error and dispersion using a test signal is also evaluated.
Metrological support of phase-chronometric systems (part 2)
Engineering Education # 01, January 2013
DOI: 10.7463/0113.0514350
This article presents a description of a measuring plan for estimating metrological characteristics of a measuring channel for operation of a complex technical object where there is a restriction on access to its primary transducers due to repair intervals. In these conditions it is necessary to evaluate metrological characteristics of measuring channels while machines and mechanisms operate. In this case, controlled parameters of the measuring channel must be independent of the features of the device operation and external actions. The proposed method is implemented with the use of multi measurement and measurement planning processes. The quality of the measuring process relative to the systematic error and dispersion using a test signal is also evaluated.
Quickly proceeding transitive modes of functioning turbine dtive shaft of the powerful turbine unit
Engineering Education # 05, May 2011
The article contains research results of transients into turbine shafts of power turbine units of thermal power station and a state district power station made with a help of new phase-chronometric method using precision measurements with the relative error no more than 5∙10-4 on industrial frequency. The acceptability  of  a method is also regarded in respect of turbine units diagnostics. The researches have been executed on two types turbine units Т-250 and Т-200. There are shown in details the results of transients registration at generator switching  in an external network and switching off it, influencing weariness accumulation in turbine shaft metal. There is also presented an influence of impulses from an internal network on a turbine shaft rotation mode, not  be registering by regular equipment of thermal power station. The turbine shaft twisting fluctuations spectra of turbine units  are presented
 
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